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B) Design principles. Many people have listed seven principles, such as single duty principle, opening and closing principle, Richter substitution principle, dependence inversion principle, interface isolation principle, composite reuse principle and Dimit principle. LSP, I elevated it to one of the three cornerstones of the object-oriented paradigm; Single responsibility and interface isolation are mainly used as the principle of responsibility division in object-oriented analysis/OOA, which you can not pay much attention to at this time. Relying on the inversion principle, I throw it away as garbage, because the opening and closing principle or directly "relying on abstract type principle" already contains the essence of relying on the inversion principle, while the dross of relying on the inversion principle is inherited by IoC. Of course, the pullback, I emphasize very much. Therefore, you need to master the abstract dependency principle (OCP), one-way dependency principle (including the learning of callbacks) and the minimum dependency principle (composite reuse principle, Dimit rule).保护伞公司在海底建造了逼真的模拟城市，并使用克隆人作为T病毒的实验对象，为了抵达出口，爱丽丝一行人必须穿越东京、纽约、华盛顿和莫斯科四座城市，而每座城市中，都有属于它的丧尸们在蠢蠢欲动。The same case can be used in other products, such as tourism. After the order is placed, the user still needs to make strategies, check what he needs to bring, and matters needing attention, etc., which can be pushed to the user.晚清年间的浙江余杭县仓前镇……一日，年轻貌美的小白菜在一家酒楼巧遇帮人写诉状的杨乃武，杨乃武顿为小白菜的美貌吸引，而小白菜又正好租下了杨乃武家的房子。杨乃武怜惜小白菜的身世，让她帮忙整理新书房和做些杂活，以贴补家用。二人朝夕相处，小白菜从此迷上了杨乃武的多才潇洒。这事被丫鬟葛三姑察觉，二人将葛三姑哄住，葛三姑答应守密。小白菜要托付终身，杨乃武许诺等他中举，就帮小白菜与葛小大解除婚约，自己休掉杨詹氏，然后娶她为妻。二人互换信物。小白菜满心欢喜，日夜憧憬，但想到就要与自己的未婚夫葛小大圆房，不免忐忑。Beijing曾经在博得全世界人气的MMORPG《UNION》中成为传说的小学生队伍“昴星团”。但，在游戏中GAME OVER的旭姬，在现实中也同时死亡了。《UNION》运营停止，“昴星团”的成员也各奔东西。